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by NewtownGal
Sun Mar 22, 2020 6:30 pm
Forum: General discussion
Topic: RPi (Zero) in extreme temperatures experiences
Replies: 13
Views: 1674

Re: RPi (Zero) in extreme temperatures experiences

The problem is that high ambient temperatures can be achieved easily when a device is in a closed container, or when airflow around the device is restricted, so its heat is trapped, and the container is in the sun, especially if the color of the container is chosen poorly. In this case, the ambient ...
by NewtownGal
Sun Mar 22, 2020 3:19 pm
Forum: General discussion
Topic: RPi (Zero) in extreme temperatures experiences
Replies: 13
Views: 1674

Re: RPi (Zero) in extreme temperatures experiences

I will start a new thread but let me respond to your comments, which are greatly appreciated. When people talk about the cpu throttling at 82C, isn't that the die temperature since that's the only temperature the system knows ? What software does the throttling ? So, how is it that people presumably...
by NewtownGal
Sun Mar 22, 2020 1:35 pm
Forum: General discussion
Topic: RPi (Zero) in extreme temperatures experiences
Replies: 13
Views: 1674

Re: RPi (Zero) in extreme temperatures experiences

I want to see just how hot an environment the Pi Zero can operate in. I'm concerned that many thermal details are being glossed over. In particular, I'm trying to pin down the thermal resistance of the Pi Zero and the SDRAM chip that's on top of it. And, I'm trying to confirm where temperature is me...
by NewtownGal
Sun Oct 21, 2018 5:51 pm
Forum: General discussion
Topic: Re: Stretch reboot and shutdown command syntax has changed!
Replies: 7
Views: 798

Re: Stretch reboot and shutdown command syntax has changed!

People have asked why I need to issue a shutdown command as some number of seconds. I tell you in the next paragraph, but I still don't understand why the ability to do so was removed. This breaks transitions from one version of the OS to another and is EXACTLY why I have continued to use an older v...
by NewtownGal
Sat Oct 20, 2018 7:49 pm
Forum: General discussion
Topic: stretch Reboot and shutdown command syntax has changed!
Replies: 16
Views: 1137

Re: PiZeroW - Reboot and shutdown no longer work

How do I use an older version of the shutdown command ? I ** need ** a shutdown that starts in 10 seconds, so the current spec for X-number of minutes, or at a time at hours:minutes -- no seconds -- does not work for me. But the real issue is, why have commands changed ? It breaks stuff. How many sy...
by NewtownGal
Sat Oct 20, 2018 6:01 pm
Forum: General discussion
Topic: stretch Reboot and shutdown command syntax has changed!
Replies: 16
Views: 1137

Re: PiZeroW - Reboot and shutdown no longer work

My point is that the shutdown command stopped working, on a Pi Zero no less, which is the crux of this posting.
by NewtownGal
Sat Oct 20, 2018 3:15 pm
Forum: General discussion
Topic: stretch Reboot and shutdown command syntax has changed!
Replies: 16
Views: 1137

stretch Reboot and shutdown command syntax has changed!

The OS guys changed the bloody command syntax !!! Look at the shutdown command syntax for Wheezy. Compare it to Stretch. Wheezy uses -t 10 to give shutdown in 10 ** seconds **. Stretch no longer has -t, sees the 10, and shuts down in 10 ** minutes ** !!! And that's not the only bloody command whose ...
by NewtownGal
Fri Jun 22, 2018 1:01 pm
Forum: Raspbian
Topic: Erroneous synchronize cache failed on Raspian, and unwanted USB logging
Replies: 1
Views: 465

Erroneous synchronize cache failed on Raspian, and unwanted USB logging

I have two problems using a USB flash drive with Raspian; be patient, these are not the usual problems: 1) As I properly unmount and disconnect (power-down) the USB drive, I get: Jun 22 06:33:22 N-12 kernel: [1172745.938166] usb 1-1.3: USB disconnect, device number 84 Jun 22 06:33:22 N-12 kernel: [1...
by NewtownGal
Fri Jan 19, 2018 4:20 pm
Forum: Troubleshooting
Topic: minicom not finding /dev/modem on Pi-Zero
Replies: 5
Views: 1802

Re: minicom not finding /dev/modem on Pi-Zero

Thank you. Using the following as root: minicom -D /dev/ttyUSB3 works and it replies: Welcome to minicom 2.6.1 OPTIONS: I18n Compiled on Apr 24 2017, 22:21:17. Port /dev/ttyUSB3 I still don't know why there's a difference in how minicom runs, but I can communicate with the modem, which is all I care...
by NewtownGal
Fri Jan 19, 2018 2:38 am
Forum: Troubleshooting
Topic: minicom not finding /dev/modem on Pi-Zero
Replies: 5
Views: 1802

Re: minicom not finding /dev/modem on Pi-Zero

I'm running 4.9.40+ #1022 on the Pi-Zero. I tried minicom -s on the Pi-Zero before making my initial post. No dice. It appears to accept a change in the serial port setup, but AT commands don't work. But that begs the issue, why does the same version of minicom run differently on a Pi-Zero than a Pi...
by NewtownGal
Thu Jan 18, 2018 7:53 pm
Forum: Troubleshooting
Topic: minicom not finding /dev/modem on Pi-Zero
Replies: 5
Views: 1802

minicom not finding /dev/modem on Pi-Zero

I'm having trouble using minicom 2.6.1 (latest) with a USB cell modem and Raspian Wheezy on a Pi-Zero, whereas the identical configuration works fine on Pi-B+ and Pi-2. To use minicom, one sets a symlink from /dev/ttyUSBx to /dev/modem. On the machines that work, if I leave out this symlink, then wh...
by NewtownGal
Sun Dec 03, 2017 2:11 pm
Forum: Camera board
Topic: LIVE555 - RTSP server
Replies: 20
Views: 43197

Re: LIVE555 - RTSP server

I realize the age of this great post, and hope someone still responds. I added the maxSize line IMMEDIATELY before the line where the server is created, and now I don't have a buffer errors. At first, I added the line at the beginning of the program, but received an error message that class OutPacke...
by NewtownGal
Sat Nov 11, 2017 4:45 pm
Forum: Networking and servers
Topic: How do I use a power-switched USB SSD to save power ?
Replies: 2
Views: 445

Re: How do I use a power-switched USB SSD to save power ?

Yes. Maybe what I need is a block device that can be accessed as an ordinary storage device but if the device is not powered and online, powers and mounts it while making the app requesting the data wait, then provides the data like an ordinary disk drive. Then, if there have not been any data reque...
by NewtownGal
Sat Nov 11, 2017 1:09 pm
Forum: Networking and servers
Topic: How do I use a power-switched USB SSD to save power ?
Replies: 2
Views: 445

How do I use a power-switched USB SSD to save power ?

I want to make a very low power, battery-operated system but one with a huge amount of disk storage that can only come from a SSD. I can't use a bunch of USB memory sticks in parallel. The system runs 24/7. The SSD has a USB interface and is only for certain data, not the OS, so there's the usual me...
by NewtownGal
Fri Sep 01, 2017 12:12 pm
Forum: Camera board
Topic: Height distortion with roi in sensor mode-2
Replies: 4
Views: 841

Re: Height distortion with roi in sensor mode-2

Thank you. That works (for rotation of 0 or 180 degrees).

What values should I use for 90-degree rotations of both sensors ?
by NewtownGal
Tue Aug 29, 2017 10:28 pm
Forum: Camera board
Topic: Height distortion with roi in sensor mode-2
Replies: 4
Views: 841

Height distortion with roi in sensor mode-2

I'm trying to get a 1920x1080, 15 fps image, from at least as many pixels, from anywhere in the full field of view of Camera-1 and Camera-2. I'm using ROI and sensor mode 2. I have read many posts, which often reflect limitations of earlier firmware and generally want a lower resolution image scaled...
by NewtownGal
Thu Apr 20, 2017 3:23 pm
Forum: General discussion
Topic: distorted roi image from Pi camera
Replies: 3
Views: 853

Re: distorted roi image from Pi camera

I'm confused. I thought h and w set the image width. Since I want 1920x1080 images, I thought we need -w 1920 and -h 1080. Does roi change the meaning of h and w ? When roi is used, does one drop h and w and let roi do the job, even though 4-digit values roi don't exactly give 1920x1080 ? Can roi se...
by NewtownGal
Wed Apr 19, 2017 3:43 pm
Forum: General discussion
Topic: distorted roi image from Pi camera
Replies: 3
Views: 853

distorted roi image from Pi camera

I'm getting grossly distorted video using roi with Pi camera 1 and Pi camera 2. I have read many posts to no avail. I'm trying to use roi to select a 1920x1080 image from anywhere in the sensor. Is this possible ? It seems to be, based on this in RaspiCamDocs Dec 2013: Allows the specification of th...
by NewtownGal
Thu Mar 30, 2017 9:18 pm
Forum: Troubleshooting
Topic: Pi Camera 2 frame rate runs too low
Replies: 15
Views: 12615

Re: Pi Camera 2 frame rate runs too low

FIXED IT. Give me the idiot prize for today. I mixed up a camera v1 and a v2. I've been testing both on the same bench. Now, with the camera v2 on the Pi Zero, which has now been updated to the latest OS, I get 90 fps (frame period = 11+ mS) in mode 6. It was v1 that gave me 57 fps in mode 6. How ca...
by NewtownGal
Thu Mar 30, 2017 8:49 pm
Forum: Troubleshooting
Topic: Pi Camera 2 frame rate runs too low
Replies: 15
Views: 12615

Re: Pi Camera 2 frame rate runs too low

More tests. No luck. Aargh ! I moved the Raspian Jessie memory card from the Pi Zero to the Pi 2 to remove the OS version from the test. It still gives 57 fps. The only difference is that it does not complain when I request 90 fps. I did apt-get update and apt-get upgrade, and rebooted. But it still...
by NewtownGal
Thu Mar 30, 2017 8:10 pm
Forum: Troubleshooting
Topic: Pi Camera 2 frame rate runs too low
Replies: 15
Views: 12615

Re: Pi Camera 2 frame rate runs too low

Two more data points: I moved the v2 camera from a Pi Zero running Jessie to a Pi 2 running Wheezy to test the effect of cpu speed. Just now, I did apt-get update and apt-get upgrade and then I updated its firmware. (1) When I request 60 fps, I still get 57 to 58 fps, same as before. (2) When I requ...
by NewtownGal
Thu Mar 30, 2017 6:00 pm
Forum: Troubleshooting
Topic: Pi Camera 2 frame rate runs too low
Replies: 15
Views: 12615

Re: Pi Camera 2 frame rate runs too low

The video flashes green when raspivid starts. I assume it's an auto exposure and white balance thing. The camera (no IR version) runs outdoors at night. Do I need to set anything other than shutterspeed and white balance so it skips the green step when it starts ?
by NewtownGal
Thu Mar 30, 2017 5:34 pm
Forum: Troubleshooting
Topic: Pi Camera 2 frame rate runs too low
Replies: 15
Views: 12615

Re: Pi Camera 2 frame rate runs too low

Based on your recommendations, I used this command on a Pi Zero that, by the way, is running from the console, not the GUI: raspivid -t 15000 -md 6 -fps 60 -w 1260 -h 720 -pts timestamps_1314_033017.txt -o video_1314_033017.h264 It gives 17+ mS/frame (no change) = only 57 to 58 fps, but the warning,...
by NewtownGal
Thu Mar 30, 2017 3:43 pm
Forum: Troubleshooting
Topic: Pi Camera 2 frame rate runs too low
Replies: 15
Views: 12615

Re: Pi Camera 2 frame rate runs too low

Maximum resolution of 2592x1944 is for the older, 5 MP OmniVision sensor, which is used in Pi Camera v1, not the new, 8 MP Sony sensor used in Pi Camera v2. What is the mode table for Pi Camera v2, which is the one I'm using ?
by NewtownGal
Thu Mar 30, 2017 2:30 pm
Forum: Troubleshooting
Topic: Pi Camera 2 frame rate runs too low
Replies: 15
Views: 12615

Re: Pi Camera 2 frame rate runs too low

That's for Pi Camera 1. I'm using Pi Camera 2. Its mode 6 is 40-90 fps according to this:

http://picamera.readthedocs.io/en/release-1.12/fov.html

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